Static information storage and retrieval – Radiant energy – Color centers
Patent
1985-07-08
1987-03-10
Moffitt, James W.
Static information storage and retrieval
Radiant energy
Color centers
G11C 1142
Patent
active
046495185
ABSTRACT:
An optical recording device includes a crystal selected from the group of alkali metal halides or alkali-earth halides and is doped with an alkali metal dopant and negative hydride ions to form a doped crystal. The doped crystal is formed to have a hydride light absorption band centered about a predetermined frequency and a color center light absorption band centered about another predetermined frequency. The doped crystal exhibits two switching states with the first state having a light absorption level in the hydride band and a low light absorption level in the color center band and a second state having a light absorption level in the hydride band and a high light absorption level in the color center band. The doped crystal is repeatedly switchable between the states by the irradiation of switching light of a selected intensity in the hydride band to switch the state of the doped crystal from the first state to the second state and by the irradiation of switching light of a selected intensity in the color center band to switch the state of the doped crystal from the second state to the first state. Multi-layered devices employing different doped crystal layers may be employed to vertically store additional bits of information.
REFERENCES:
patent: 3771150 (1973-11-01), Schneider
patent: 4091375 (1978-05-01), Robillard
Pp. 28-30 of Proceedings of a Physical Society by R. W. Pohl, (London), vol. 40 E3 (1937).
Pp. 89-91 from Review of Modern Physics, vol. 26, No. 1, Jan. 1954.
Pp. 109-110 of book, "Physics of Color Centers", edited by W. Beall Fowler, Academic Press, New York & London (1968).
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